schmid



(No Model.) 3 Sheets-Sheet 1.

A. SUHMED.

BRUSH HOLDER FOR ELECTRIC MACHINES. No. 387,010. Eatented July 31, 1888.

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' A. SGHMID.

BRUSH HOLDER PORELBGTRIG MACHINES.

Patefited July 31, 1888;

INVENTOR,

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M A TTORI/EYG.

3 SheetS -Sheet s.

(No Model.)

A. SGHMID. BRUSH HOLDER FOR ELEGTRIG MACHINES.

Patented July 31, 1888.

. the armature shaft.

'6 is a transversesection UNITED STATES )1? h lix/11.40

PATENT ELECTRIC GOIVHA NY, OF

ll'i" S BU itG, PENNSYLVANIA.

BRUSH-HOLDER FOR ELECTREQ MACl-HNES SPECIFICATION forming part of Letters Patent No. 387,010, dated July 31, 9.888.

Application filed September 1, 1887. Serial Nair-18.480. (No model.)

To all .whom it may concern..-

Be it known that I', ALBERT ScnMm, a citizen oft-he Republic of Switzerland, residing in Allegheny, in the county ofAlleghenyand State of Fennsylvania, have invented certain new and useful"Improvements in Brush-Holdore for Electric Machines, of which the followiug" is a specification.

ihe inventioirrcl'ates to the construction of brush-holders fog the collectors and comm utators of electric machines. The invention consists in certain novel con strnctions and arrangements of parts, whereby the brushes may be easily adjusted and re placed during the operation of the machine.

Theinveution will be described in detail in 'connection with the accompanying drawings,

in which- Figure l is plan View of the brush-holder as applied to a collector. Figs. 2 and 5 are end views, partly in section. Fig. 3 is a side view, partly in section. Fig. 4 is a view of the adjustable bracket carrying the brushes. Fig. showing clamps holding the brushes, and Figs. 7 and 8 illustrate the operation of the device employed for rais= ing the brushes from the collcctorrings.

Referring to the. figures, A represents a bracket for supporting the various parts of the device. This bracket may be cast in a single piece, and it is designed to turn about It is provided with handles a a of noncoudnctiug material. Rectangular openings (0 a are formed, in which are set non'condncting blocks or bushes a a". These receive the squared ends I) (see Fig. 3) of the clamp-carrying rods or bolts 0 b rods or bolts are fastened in position by nuts '0 0, but these nuts are insulated from the frame or support A by insulating bushings, as indicated. The rods 7) and I) each carry two col lcctor-brushes, and, as they are similar to each other, only one set need be described. The brushes c'c carried upon the rod 1), (see Figs. 1 and (3,) are held in clamps 1'1 and E of convenient construction. Those here shown con- Nli of boxesffflhaving:nljustablc screwsf" f, carrying elalnpingplates. :nnlf". These plates hold the brushes against the lower portions of the boxes,, but either may be raised for the purpose oFromoving the correspond The ins, brush at will. The boxes are carried upon a thimble or bush, II, which slips over the rod 1), and it is fastened in position by set screws h and h", passing through washers O and 0. These enter the groove It, formed in the rod b. The boxes f and f are capable of being turned upon the sleeve or hush H; but their positions are governed by the devices K and K now to be described. These devices are similar and one only need' be described in detail. An arm, h, projects from the lower portion of the boxf', and it is pivoted to the end of an adjustable threaded bar, a, which in turn is carried upon a rod, or, supported in the arm 0, extending from the washer O. A. spring, 0, is compressed between the bar a. and the-end of the rod a. A. nut, n, upon the end of the rod adjusts the same an d. determines .the pressure with which the spring 0 shall force the brush 0, carried by the corresponding clamp, against the commutator or ring 1?. (See Fig. 7.)

When it is desired to raise either brush from the collector ring or commutator, the hot: carrying the same is turned backward, as shown in Fig. 8, and the link-connection between the box and the rod it permits the parts to assume the position shown in Fig. 8, holding the brush away from the collector ring or counnutator. As there are two brushes for each collectorring or commutator; either brush may be thus temporarily removed without intcrrnpti ng tln operation of the machine. A rod, t, extends from one arm, 0, to the corresponding arm,0 carried upon the bushing ll, and this serves to bind the parts together, and at the same time as a limiting -stop for the arm k when the brushes are thrown back from the commutator or collector-rings.

For the purpose of adjusting; the position of the brushes upon the rings or upon the commutaior, the bracket A is provided with a curved slot, 1', through which there extends a sct-screwflt, by means of which it is bound to a portion, S, of the frame of the machine. By loosening the sot-screw the entire brush-holder may therefore be turned into any required po sition. The spring s exerts sni'ficient tension to prevent any accidental slipping of o? brush-holder during the adjustment.

When it is desired to reverse the dire of the motion of the machine, the brushes maybe removed by simply loosening the set-screws h and h and slipping off from the rod b or b the entire device carried upon the bushing H and replacingitin an inverted position. This will bring the brushes which are upon the upper side upon the underside, and vice versa.

Connections are made with the respective rods b andb? through binding-plates u and a, fastened between the nuts 0 and the correspondinginsulating-washer.

I claim as my invention- 1. The combination of a.snpporting-frame forcommutator or collector brushes, an insurq lated bar carried thereby, two brush-clamps, a symmetrically-formed straight sleeve surrounding the rod upon which the clamps are carried and from either end of which't'hey may be removed, a tension device for each clamp 2o normally pressing the corresponding brush against its commutator, and detachable hold-- ing devices for permitting the removal of said sleeve from said bar for reversing its position thereon, thereby bringing the brushes upon 2 5 the opposite sides of the commutator, snbsta'ntially as described;

2. The combination of a supporting-frame for commutator or collector brushes, an insulated rodearried thereby,- two brush-clamps,- 0 a sleeve carrying the same supported upon said rod, a tension device for each clamp normall y pressing the corresponding brush against its commutator, and aspring pressing the brush toward or from the ring, accordingly as it is 5 movedto one side or the other of the center of support of the brush.

3.1%r brush-holding clamp for electric ma-- chines, consisting of two movable boxes, an arm extending therefrom, a pivoted yielding r 40 rod, to which said arm is pivoted, permitting the turning of said rod upon one side or the other of the line joining the centers of the sup port of the clamp and of said pivoted rod, and a spring pressing said rod against said arm.

4. The combination of the clamps E and E, 4 5 the bush H, carrying the same, therod 0, carried upon the bush and connected therewith. the pivoted bar a, and the extension k, coupled. therewith,and theyielding spring o,surrouud- 'ing the bar a, substantially as and for the pur- 5o pose described.

5. The combinatiomwith a'brushholder for electric machines, of a spring compressed betweenthe clamp and its support and exerting its force in a direction oblique .to the support of the clamp, and means for carrying the spring into a second position upon the opposite side of the support. y

6. The combination, withan eiectric gem erator or motor and its revolving commutator or collector, of a movable brush-holder, and an eccentric-spring exerting stress upon the brush-holder in one direetiomor the opposite accordingly as the spring is oved from oneside to the other of the center of support of G5- ALBERT SCHMID. Witnesses:

W. D. UPTEGRAFF DANE. W. EDGEOOMB. 

